126831999 has 16 divisors (see below), whose sum is σ = 193476608. Its totient is φ = 72397152.

The previous prime is 126831989. The next prime is 126832001. The reversal of 126831999 is 999138621.

It is not a de Polignac number, because 126831999 - 2¹¹ = 126829951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126831989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20754 + ... + 26160.

It is an arithmetic number, because the mean of its divisors is an integer number (12092288).

Almost surely, 2^126831999 is an apocalyptic number.

126831999 is a deficient number, since it is larger than the sum of its proper divisors (66644609).

126831999 is a wasteful number, since it uses less digits than its factorization.

126831999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6534.

The product of its digits is 209952, while the sum is 48.

The square root of 126831999 is about 11261.9713638421. The cubic root of 126831999 is about 502.4308283292.

The spelling of 126831999 in words is "one hundred twenty-six million, eight hundred thirty-one thousand, nine hundred ninety-nine".